[NaCl SDK] Make the SDK examples buildable as a packaged app.

native_client_sdk/src/examples/pi_generator/example.dsc

 {
   'TOOLS': ['newlib', 'glibc', 'pnacl', 'win', 'linux'],
   'TARGETS': [
     {
       'NAME' : 'pi_generator',
       'TYPE' : 'main',
       'SOURCES' : [
         'pi_generator.cc',
         'pi_generator.h',
         'pi_generator_module.cc'
       ],
       'LIBS': ['ppapi_cpp', 'ppapi', 'pthread']
     }
   ],
   'DATA': [
     'example.js',
   ],
   'DEST': 'examples',
   'NAME': 'pi_generator',
   'TITLE': 'Monte Carlo Estimate for Pi',
-  'DESC': """
-The Pi Generator example demonstrates creating a helper thread that
-estimate pi using the Monte Carlo method while randomly putting 1,000,000,000
-points inside a 2D square that shares two sides with a quarter circle.""",
-  'FOCUS': 'Thread creation, 2D graphics, view change events.',
   'GROUP': 'Concepts'
 }